15 Things that Twitter calls spam

Ever wondered what twitter considers spam ? Well here is a list to start with
  1. If you have followed a large amount of users in a short amount of time;
  2. If you have followed and unfollowed people in a short time period, particularly by automated means (aggressive follower churn)
  3. If you repeatedly follow and unfollow people, whether to build followers or to garner more attention for your profile
  4. If you have a small number of followers compared to the amount of people you are following
  5. If your updates consist mainly of links, and not personal updates
  6. If a large number of people are blocking you
  7. The number of spam complaints that have been filed against you
  8. If you post duplicate content over multiple accounts or multiple duplicate updates on one account
  9. If you post multiple unrelated updates to a topic using hashtags
  10. If you post multiple unrelated updates to a trending or popular topic
  11. If you send large numbers of duplicate @replies
  12. If you send large numbers of unsolicited @replies in an attempt to spam a service or link
  13. If you repost other user’s content without attribution.
  14. If you have attempted to “sell” followers, particularly through tactics considered aggressive following or follower churn.
  15. Using or promoting third-party sites that claim to get you more followers (such as follower trains, sites promising “more followers fast,” or any other site that offers to automatically add followers to your account).